Study of parametric resonance vibrations in the underway of a tracked vehicles

Nowadays increased requirements to modern high-speed tracked vehicles are imposed on various operational and functional characteristics. In particular, special requirements are imposed on the level of oscillation load, which determines the performance of various structural elements of the caterpillar drive, the suspension system, and other components and assemblies of machines, including additional equipment mounted on the base chassis. In the proposed paper, the interaction of the caterpillar drive with the road wheel when moving on hard soils is considered, as one of the main sources of the formation of high-frequency oscillation loading of the machine. A connection is established between the parametric change in the rigidity of the elastic interaction of the road wheel and the rubberized treadmill with increased dynamic and thermal tension of the massive tires of the road wheels. A complex of mathematical models for the numerical determination of the oscillation and thermal loading of road wheels is being developed, the stability of the obtained periodic solutions is estimated based on the analysis of parametric oscillations using the Ains-Strett diagram. On the basis of the research results, the necessary value of the modulation depth of the elastic interaction stiffness is substantiated, which ensures the elimination of parametric resonances. It is shown that the displacement of the gaps between of trucks by giving it a “zigzag” shape increases the elastic convergence of the axle of the road wheel with the rubberized treadmill in the area of the rubber-metal hinges. This makes it possible to reduce the modulation acceleration parameter μ (and, accordingly, the parameter of the Aynes-Strett diagram) by 40 %, which reduces the likelihood of excitation of resonant oscillation parameters when using a road wheel massive tire and a rubberized treadmill. In addition, the paper presents the results of an experimental study of the thermal stress of the massive tires of road wheels of high-speed tracked vehicles. The existing method for calculating the thermal stress of the massive tires of road wheels is analyzed, phenomena that are not taken into account in this method are revealed, but which have a significant effect on the change in the temperature of the inner layers of massive tires of high-speed tracked vehicles.